Safety tap or cock.



' kPATENIED MAR. 21. 1905.

* 'I'. SCHMIDT.

SAFETY TAP 0R COCK.

APPLxoATIox Hmm :um: 21.1904.

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@y f@ MW UNITED STATES 4Patented. March 21, 1905.

FERDINAND SCHMIDT, OF BRESLAU, GERMANY.

SAFETY TAP OR COCK.

SPECIFICATION forming part of Letters Patent No. 785,331, dated March 21, 1905.

Application filed June 3, 1904:. Serial No. 211,018.

To LZ/Z whom, t may concern:

Be it known that I, FERDINAND SCHMIDT, a subject of the Emperor of Germany, and a resident ofBreslau, Germany, have invented certain new and useful Improvements in Safety Taps or Cocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an improved safety tap or cock.

On the shutting of a cock, such as the usual gas-tap, the hand must of course turn more or less. As the hand is withdrawn from the closed tap it tends at the same time to execute an involuntary movement in the opposite direction-that is to say, in the direction in which the opening of the tap takes place, so that it may again assume its normal position. Especially is this the case when the handle ofthe tap must beheld by the outstretched arm with the hand directed vertically upward, a position involved whenever the tap is placed above the height of the body. If it happens that the hand before the commencement of this involuntary movement has not yet entirely released the handle of the tap, then in consequence of this motion the tap already closed will obviously be again opened a little. The tap then remains open, although the operator believes it to be firmly closed, and in this manner an escape of lighting-gas, for instance, may take place and lead to .vitiation of the atmosphere, or, if ignited by a light' or the like, may give rise to explosions and fire. Recognizing these conditions, I have devised a tap having a handle arranged movably upon the plug in such a manner that the closing of the tap is eected by turning the handle through a quarter of a circle exactly in the same manner as in ordinary taps; but the opening ofthe tap, on the other hand, cannot be effected by ,turning the handle at all, but vrequires for this purpose a special mechanism.

A constructional form of the invention is illustrated in the accompanying drawings.

F igure 1 shows a side elevation of the apparatus. Fig. 2 shows an elevation and partial section of the apparatus at right angles to Fig. l. Fig. 3 illustrates a detail in section, and the diagrammatic Figs. 4 to 8 show the operation of the tap in different positions.

The handle c engages, by means of its prolongation a, into a recess of the plug which is provided with the bore-hole d. A stop-pin e is screwed into the projection a and passes through a longitudinal slot f, Fig. 3, of the part b. The tap-casing 7c is provided at c', Fig. 2, with an aperture as is usual in ordinary gas-taps,` in which aperture free play is given vto the pin @,Ysecured yto the handle c, during thev turning of the tap, but so that the said pin will find a stop and support on the flattened side walls, so that the handle can only move within a quarter of a circle. For the purpose of the direct turning of the. plug the same is provided with a handle, such as the arm g and attachment.

The operation of the improved tap will be clear from the foregoing description of parts. When the tap is opened and the parts are in the position illustrated in Fig. 4, the pin e rests upon the surface /L of the longitudinal slot f of the plug and also against the leftside edge of the aperture in the casing. On turning the handle c in the direction indicated by the arrow, Fig. i, the pin of the plug is also pressed in the same direction, Fig. 5, whereby the tap is closed and the pin comes to rest against the right-side edge of the casing-aperture, Fig. 6. Upon the reverse motion of the handle in the opposite direction the pin will pass freely through the longitudinal slot, so that the plugwill not be turned, Fig. 7, and consequently the tap cannot be opened, because the pin linally again rests against the left-side edge of the casing-aperture, Fig. 8. In order to open the tap, the plug is turned directly by means of the mechanism g, whereby simultaneously edge L carries the pin e with it, and thereby moves correspondingly the handle. y

The above, explanation relates to a gas-tap. It is obvious that the apparatus can be used in like manner for gases or fluids in general.

What I claim isslot in said plug, and adapted to travel there- Safety-Cook for gases or liquids, eomprisin, and means for opening the cock independing in combination a perforated Casing havently of said handle, substantially as set forth. ing an aperture, a Correspondingly-perforated In Witness whereof I have hereunto set m 5 plug rotatable in said easing and having a slot hand in presence of'two Witnesses.

approximately extending over a quarter-circle and adapted to temporarily register with FERDINAND SCHMIDT' the said aperture in said casing, a handle Witnesses: freely engaging a recess in said plug, a pin SIEGFRIED LUsTIG,

IO secured to said handle extending into the said MARTIN STRINOLER. 

